Oscillator



FIG. 1 is a perspective view of a sprinkler.

FIG. 2 is a front elevation of the sprinkler.

FIG. 3 is a rear elevation of the sprinkler.

FIG. 4 is a left side elevation of the sprinkler.

FIG. 5 is a right side elevation of the sprinkler.

FIG. 6 is a top plane of the sprinkler; and,

FIG. 7 is a bottom plane of the sprinkler. 

The ornamental design for an oscillator, as shown and described. 